Safety-valve.



PATBNTBD JULY 23, 1907. 0. E. NoRToN.

SAFETY VALVE.

APPLIUATION FILED APB. 27, 1905.

rior of the casing 82'. A valve stem 162 T'NTEB STATES PATEN T TTTQE.

SAFETY-VALVE.

Specification of Letters Patent.

Patentes any as, reo?.

application ses apra 27, 1905. seria No. 257,689.

To all 'whom it may concern:

Bre it known that l, CHARLES E. NORTON, a citizen lof the United States, residing at Dorchester, in the county of Suffolk and State ofMassachusetts, have invented new and useful Improvements in Safety-Valves, of which the following is a specification.

This invention relates to safety valves, andthe object is to provide a simple, durable safety valve which shall not stick or bind in operation and in which the wear of the valve seat is automatically compensated for.

The invention consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the claims thereof.

Referring to the drawings: Figurev l is a central longitudinal sectional elevation of a safety steam valve constructedin accordance with my invention. Fig. 2 isa detail transverse section taken on line 2-2 of Fig. 1.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, 82 is a casing having an inletoriiice 92 and a series of outlet orifices 102, said outlet orifices consisting of slots extending longitudinally of the cas ing 82` and extending entirely therethrough. A cy- 'lindrical valve seat 142 is provided in the interior of the casing 82 and is located between the inlet orifice 92 and the outlet orifices v102. A valve 152 provided in its periphery with spring packing rings 192 is slidable longitudinally of the casing 82 and of the valve seat 142 and rests normally upon stops 26 provided upon the in tel projects upwardly from the valve 152 and has fast to its upper end a guide plate 27 provided with wings or radial arms 28 which contact at their outer ends with the interior of the cylindrical casing 82.

Two helical compression springs 29 and 30 are inclosed within the casing 82 and bear at their opposite ends against washers 31 and 32. The washer @l rests ,upon ,the top of the guide plate 27 while a screw 33 bears against the top of the washer 32. The screw 33 has screw-threaded engagement with a cap 172 and said cap in turn has screw-threaded engagement with the interior of the casing 82. The screw 33 is used to increase or diminishthe tension upon the springs 29 and 30 andn's held against rotation by a check nut 34.

The operation of the valve hereinbefore specifically vcylindrical valve seat, a valve stem described is as follows: Steam enters the interior of the casing 82 through the inlet orifice 92 under pressure and presses against the underside of the valve 1,52. When this pressure increases beyond the amount desired, the valve 152 is moved upwardly until the lower edge of said valve passes beyond the lower edges of the orices 102. As soon as the valve 152 arrives in the ele- I vated position referred to the steam escapes through the ori'ces .102, thus relieving the pressure upon the boiler. The spring packing rings 192 will take up any slight amount of wear which may come upon the cylindrical valve seat 142 and thus always preserve a tight 'joint between the valve 152 and its casing 82.

Having thus describedmy invention what l claim and desire by Letters Patent to secure is:

1. In a device of the character described, a casing-pro l vided with an inlet orce and a plurality of outlet oriiices,

a cylindrical vulve seat formed in said casing and located between said inlet and outlet orifices, and stops in the interior of said casing below said outlet orices; in cornbination with a.'cylind`rical valve adapted to slide longitudinally of said valve seat, a packing device located in the periphery of said valve and adapted to make sliding contact with said valve seat, a valve stem projecting upwardly from said valve, a guide plate fast to the upper end of said stem, said guide plate provided with wings which Contact at their outer ends with the interior of said casing, and a spring acting to force said guide plate and valve downwardly, to hold the underside of said valve against said stops.

2. In a device of the character described, a casing provided with an inlet oridce anda plurality of outlet oriiices, a cap fast to one end of said casing, a screw having screw-threaded engagement with said cap and projecting therethrough, a cylindrical valve seat` formed in said casing and .located between said inlet and outlet orifices,

and stops in the interior of said casing; in combination with a cylindrical valve adapted to slide longitudinally i of said seat, a packing devic'e located in -the periphery oi' said valve and adapted to make sliding contact with said projecting upwardly from said valve, a guide .plate fast to the upper end of said stein, said guide plate provided with wings which contact at their outer ends with'the interior of said casing, :1 washer bearing against said plate, another washer bearing against said screw, and a spring bearing at its opposite ends, respectively, against said washers.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

CHARLES E. NORTON. Witnesses:

@HARLES S. GooDiNG, ANNIE J. DAILEY. 

